I was trying to get the special keys on my keyboard to work. I needed to setkeycodes, but it kept saying that it was out of the 0..255 range. I figured it must have been a bug in busybox, so I updated it. After this update it worked perfectly. It has the same applets as the original busybox included with puppy 5.2 plus linuxrc.
EDIT: Also, be aware this may unload some modules. I had to manually reload the sky2 module for my Ethernet adapters after installing this.